As a tripeptide composed of glutamate, cysteine, and glycine, it functions as the primary thiol-based redox buffer, neutralizing reactive oxygen species (ROS), supporting Phase II detoxification pathways, and facilitating the excretion of xenobiotics and heavy metals [1] [8]
For example, thiol-containing glutathione can have an intracellular concentration in the millimolar range (Figure 1A) (Bennett et al, 2009)
Licinio, J
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a , Scatter plot showing the relative fold change (log 2 ) in oxidized cysteine reactivity versus relative fold change (log 2 ) in protein expression from Slc33a1- knockout KPK cells expressing a vector control compared to SLC33A1 cDNA